Issue with Size Chart plugin

Hello, I am encountering an issue when creating a new size chart with the specified plugin.

When I create a new size chart by clicking on ADD NEW and the windows open, I click on SELECT IMAGE to add a Size chart image but the button does not work. I need to publish the size chart first and then the button work. Please see video here: https://www.dropbox.com/s/mjjac8tbn3qsigc/Size%20Chart%20%E2%80%B9%20Giuliva%20Heritage%20%E2%80%94%20WordPress%20-%205%20January%202023.mp4?dl=0

Is it possibile to fix this in order not to need to publish before adding the Size Chart image?

Thank you for your support.

Best,
Annalisa